package com.xywy.common.app;

import java.io.File;  
import java.io.FileOutputStream;  
import java.io.PrintWriter;  
import java.io.StringWriter;  
import java.io.Writer;  
import java.lang.Thread.UncaughtExceptionHandler;  
import java.lang.reflect.Field;  
import java.text.DateFormat;  
import java.text.SimpleDateFormat;  
import java.util.Date;  
import java.util.HashMap;  
import java.util.Map;  
  
import android.content.Context;  
import android.content.pm.PackageInfo;  
import android.content.pm.PackageManager;  
import android.content.pm.PackageManager.NameNotFoundException;  
import android.os.Build;  
import android.os.Environment;  
import android.os.Looper;  
import android.util.Log;  
import android.widget.Toast; 

/** 
 * UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告. 
 * 需要在Application中注册，为了要在程序启动器就监控整个程序。 
 */  
public class CrashHandler implements UncaughtExceptionHandler {  
    public static final String TAG = "CrashHandler";  
    //系统默认的UncaughtException处理类  
    private Thread.UncaughtExceptionHandler mDefaultHandler;  
    //CrashHandler实例  
    private static CrashHandler instance;  
    //程序的Context对象  
    private Context mContext;  
    //用来存储设备信息和异常信息  
    private Map<String, String> infos = new HashMap<String, String>();  
    //用于格式化日期,作为日志文件名的一部分  
    private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");  
    /** 保证只有一个CrashHandler实例 */  
    private CrashHandler() {  
    }  
    /** 获取CrashHandler实例 ,单例模式 */  
    public static CrashHandler getInstance() {  
        if (instance == null)  
            instance = new CrashHandler();  
        return instance;  
    }  
    /** 
     * 初始化 
     */  
    public void init(Context context) {  
        mContext = context;  
        //获取系统默认的UncaughtException处理器  
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();  
        //设置该CrashHandler为程序的默认处理器      
        Thread.setDefaultUncaughtExceptionHandler(this);  
    }  
    /** 
     * 当UncaughtException发生时会转入该函数来处理 
     */  
    @Override  
    public void uncaughtException(Thread thread, Throwable ex) {  
        if (!handleException(ex) && mDefaultHandler != null) {  
            //如果用户没有处理则让系统默认的异常处理器来处理  
            mDefaultHandler.uncaughtException(thread, ex);  
        } else {  
            try {  
                Thread.sleep(3000);  
            } catch (InterruptedException e) {  
                Log.e(TAG, "error : ", e);  
            }  
            //退出程序      
            android.os.Process.killProcess(android.os.Process.myPid());  
            System.exit(1);  
        }  
    }  
    /** 
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成. 
     * @param ex 
     * @return true:如果处理了该异常信息;否则返回false. 
     */  
    private boolean handleException(Throwable ex) {  
        if (ex == null) {  
            return false;  
        }  
        //收集设备参数信息  
        collectDeviceInfo(mContext);  
        //使用Toast来显示异常信息  
        new Thread() {  
            @Override  
            public void run() {  
                Looper.prepare();  
                Toast.makeText(mContext, "很抱歉,程序出现异常,即将退出.", Toast.LENGTH_SHORT).show();  
                Looper.loop();  
            }  
        }.start();  
        //保存日志文件       
        saveCatchInfo2File(ex);  
        return true;  
    }  
    /** 
     * 收集设备参数信息 
     * @param ctx 
     */  
    public void collectDeviceInfo(Context ctx) {  
        try {  
            PackageManager pm = ctx.getPackageManager();  
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);  
            if (pi != null) {  
                String versionName = pi.versionName == null ? "null" : pi.versionName;  
                String versionCode = pi.versionCode + "";  
                infos.put("versionName", versionName);  
                infos.put("versionCode", versionCode);  
            }  
        } catch (NameNotFoundException e) {  
            Log.e(TAG, "an error occured when collect package info", e);  
        }  
        Field[] fields = Build.class.getDeclaredFields();  
        for (Field field : fields) {  
            try {  
                field.setAccessible(true);  
                infos.put(field.getName(), field.get(null).toString());  
                Log.d(TAG, field.getName() + " : " + field.get(null));  
            } catch (Exception e) {  
                Log.e(TAG, "an error occured when collect crash info", e);  
            }  
        }  
    }  
    private String getFilePath() {  
        String file_dir = "";  
        // SD卡是否存在  
        boolean isSDCardExist = Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());  
        // Environment.getExternalStorageDirectory()相当于File file=new File("/sdcard")  
        boolean isRootDirExist = Environment.getExternalStorageDirectory().exists();  
        if (isSDCardExist && isRootDirExist) {  
            file_dir = Environment.getExternalStorageDirectory().getAbsolutePath() + "/crashlog/";  
        } else {  
            // MyApplication.getInstance().getFilesDir()返回的路劲为/data/data/PACKAGE_NAME/files，其中的包就是我们建立的主Activity所在的包  
            file_dir = MainApplication.getInstance().getFilesDir().getAbsolutePath() + "/crashlog/";  
        }  
        return file_dir;  
    }  
    /** 
     * 保存错误信息到文件中 
     * @param ex 
     * @return 返回文件名称,便于将文件传送到服务器 
     */  
    private String saveCatchInfo2File(Throwable ex) {  
        StringBuffer sb = new StringBuffer();  
        for (Map.Entry<String, String> entry : infos.entrySet()) {  
            String key = entry.getKey();  
            String value = entry.getValue();  
            sb.append(key + "=" + value + "\n");  
        }  
        Writer writer = new StringWriter();  
        PrintWriter printWriter = new PrintWriter(writer);  
        ex.printStackTrace(printWriter);  
        Throwable cause = ex.getCause();  
        while (cause != null) {  
            cause.printStackTrace(printWriter);  
            cause = cause.getCause();  
        }  
        printWriter.close();  
        String result = writer.toString();  
        sb.append(result);  
        try {  
            long timestamp = System.currentTimeMillis();  
            String time = formatter.format(new Date());  
            String fileName = "crash-" + time + "-" + timestamp + ".log";  
            String file_dir = getFilePath();  
            //          if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {  
            File dir = new File(file_dir);  
            if (!dir.exists()) {  
                dir.mkdirs();  
            }  
            File file = new File(file_dir + fileName);  
            if (!file.exists()) {  
                file.createNewFile();  
            }  
            FileOutputStream fos = new FileOutputStream(file);  
            fos.write(sb.toString().getBytes());  
            //发送给开发人员  
            sendCrashLog2PM(file_dir + fileName);  
            fos.close();  
            //          }  
            return fileName;  
        } catch (Exception e) {  
            Log.e(TAG, "an error occured while writing file...", e);  
        }  
        return null;  
    }  
    /** 
     * 将捕获的导致崩溃的错误信息发送给开发人员 
     * 目前只将log日志保存在sdcard 和输出到LogCat中，并未发送给后台。 
     */  
    private void sendCrashLog2PM(String fileName) {  
        //      if (!new File(fileName).exists()) {  
        //          Toast.makeText(mContext, "日志文件不存在！", Toast.LENGTH_SHORT).show();  
        //          return;  
        //      }  
        //      FileInputStream fis = null;  
        //      BufferedReader reader = null;  
        //      String s = null;  
        //      try {  
        //          fis = new FileInputStream(fileName);  
        //          reader = new BufferedReader(new InputStreamReader(fis, "GBK"));  
        //          while (true) {  
        //              s = reader.readLine();  
        //              if (s == null)  
        //                  break;  
        //              //由于目前尚未确定以何种方式发送，所以先打出log日志。  
        //              Log.i("info", s.toString());  
        //          }  
        //      } catch (FileNotFoundException e) {  
        //          e.printStackTrace();  
        //      } catch (IOException e) {  
        //          e.printStackTrace();  
        //      } finally { // 关闭流  
        //          try {  
        //              reader.close();  
        //              fis.close();  
        //          } catch (IOException e) {  
        //              e.printStackTrace();  
        //          }  
        //      }  
    }  
}  